Any of you know of a place you would recomend to get it checked out in this area or 100 miles or so from Enid, Okla? Already had the Furlong looked at here and they did not find any problem. So I figure it must be in the Rev or the TC M300. Checked all the cables and no problems. Never been dropped. Tried my system thru my n-112 and still had a hum.

That will tell you one way or the other if the effects unit is the source of the problem. Do you run the effects through the revelation loop or in-between the preamp and Furlong?

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How high are you setting your gain / volume control on the Furlong. If it is set too high, you will get a lot of white noise. I usually run my Furlong gain just above 1/2 way. That setting depends on how hot of a signal you are sending from your preamp.

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Did you try eliminating the rack altogether and playing through the Nashville 112 to see if you still have the hum. If you still have the hum, then its from something else in your system.

A common problem, whether its your problem or not, is one unit can be causing it with the metal rack rails and the different devices "rack ears" screwed to the metal rack.

Remove all the rack ear screws. Then, with it all powered on and connected, lift one device so its not touching the rack rails at the rack ears and also make sure the nothing is touching and see if the hum goes away. If not, set that device back down and lift one of the others. Try it with each unit and see if one of them is causing it. If it is one of the units "feeding back" through the rack ears, you can use nylon (Non metallic) washers to isolate each device from the rack rails and even use nylon screws instead of the metal rack screws. There is also commercially sold "Humfrees" for isolating._________________Franklin D-10, Hilton VP, POD X3, MatchBro, Steelaire Rack, EPS-15C, Cakewalk (Sonar) by BandLab and Studio One Pro V4.5 DAWs, MOTU 4pre
R.O.P.E. Member

Also Michael's approach of too many paths to ground with the multiple AC outlet connections instead of all units [including your amp] through one AC outlet source, could be an issue causing the ground loop.

I would start with checking all your rig's ACis sourced from one outlet first before attempting the other solutions._________________ShoBud The Pro 1
YES it's my REAL NAME!

Do a forum search for “wall outlet hum,” in it I posted instructions and a diagram on how to build an outlet box with hum X or Ebtech hum eliminator circuit in it. It will get rid of your hum without causing any safety issues by lifting any grounds. Minimal soldering skills required.

Jack Stoner

From:Inverness, Fl

Posted 18 May 2019 7:40 am

Quote:

I would start with checking all your rig's AC is sourced from one outlet first before attempting the other solutions.
_________________

Whether everything is powered from one outlet or separate doesn't make a difference. There can still be ground loop hum either way._________________Franklin D-10, Hilton VP, POD X3, MatchBro, Steelaire Rack, EPS-15C, Cakewalk (Sonar) by BandLab and Studio One Pro V4.5 DAWs, MOTU 4pre
R.O.P.E. Member

Michael Hill

From:Arizona, USA

Posted 19 May 2019 10:24 am

Using multiple outlets is the most common source of a ground loop hum.

If a balanced cable fixes your problem, your old cables were picking up noise from somewhere. A balanced cable makes no difference for a ground loop hum.

Jack Ritter

From:Enid, Oklahoma, USA

Posted 21 May 2019 10:13 amI think we got it back to no humming.

I have everything plugged into 1 source power cord built into my players seat and the hum was not there. Thanks for all your help and replies. What a relief!